XU Dao-feng 1, HUANG Yong-ming1, YANG Lv-xi1. Superposition based direct downlink channel state information feedback method[J]. 2009, 30(1): 62-69.DOI:
叠加信息序列的下行信道信息直接反馈方法
摘要
提出一种低代价下行信道信息实时反馈方法
它将上行的信息序列与下行的信道信息叠加后上传
而不必为下行信道信息分配单独的系统资源。在保证信息序列误码性能及下行信道信息估计精度的前提下
牺牲一部分上行信息序列的误码性能以换取高的频谱利用率。由于对下行信道信息进行了扩频处理
故即使分配较低的能量也能在基站侧进行可靠地恢复。仿真实验证明了这种方法的有效性。
Abstract
A low cost
real-time feedback method for downlink channel state information (DL-CSI) was proposed. DL-CSI was superimposed with uplink user sequences (UL-US) before transmission and thus exclusive occupation of system resources could be avoided. With guaranteed UL-US SER performance and DL-CSI estimation accuracy
higher spectral efficiency could be achieved by sacrificing some UL-US’s symbol error rate (SER) performance. Due to spreading processing
DL-CSI could be accurately recovered even with little allocated energy. Simulations demonstrated the practicability of the proposed method.